The current study will assess the clinical Assessment of SpondyloArthritis international Society (ASAS) 20 response to Secukinumab and evaluate to which extent concomitant nonsteroidal anti-inflammatory drug (NSAID) treatment can be reduced in patients treated with Secukinumab or placebo following an initial run-in phase of stable NSAID therapy. In case of a positive outcome concerning the NSAID reduction this study could trigger the development of a guidance concerning NSAID reduction applicable for all Ankylosing Spondylitis (AS) patients starting a biologic treatment.